Start with fond (those browned bits stuck to the pan), add liquid, then mount with butter — that's the whole magic. Here's how it works: After you sear meat or sauté vegetables, pour off most of the fat, leaving just a thin layer. Add your liquid (wine, stock, even water) and scrape the pan with a wooden spoon while it sizzles. Those stuck-on bits dissolve into the liquid and give you deep, savory flavor instantly. Let it bubble down until it's reduced by half or so — this concentrates the taste and thickens it slightly. At the very end, while the pan is off heat, whisk in cold butter (cut into small pieces). The butter emulsifies into the sauce, making it glossy and silky. This last step is called "mounting" — it transforms a thin, sharp liquid into something luxurious. Season with salt and a pinch of acid (lemon juice, vinegar) to balance it all. The key is not crowding the pan when you sear — you need real browning to build that fond. And always scrape while the pan is hot so the stuck bits dissolve instead of burning.
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